CPT® Code 26591

The procedure described by CPT® Code 26591 involves the repair of the intrinsic muscles of the hand, which are essential for the fine motor functions and dexterity of the fingers. The intrinsic muscles are categorized into four distinct groups: the thenar muscles, which control thumb movements; the hypothenar muscles, which manage movements of the small finger; the lumbrical muscles, which facilitate the flexion of the metacarpophalangeal joints and extension of the interphalangeal joints; and the interossei muscles, which are responsible for the abduction and adduction of the fingers. This repair procedure is typically indicated following a traumatic injury, such as a laceration, that compromises the integrity of these muscles. During the repair process, if an open wound is present, it is first explored to assess the extent of the injury. Any devitalized tissue is debrided, and foreign materials are removed to prepare the site for repair. The intrinsic muscle is then meticulously sutured back together, and the surrounding soft tissues and skin are closed in layers to promote healing. It is important to report each intrinsic muscle that requires repair separately, as each muscle plays a critical role in hand function.